Jesus this is a great forum, you guys really help each other out. I thank you guys for helping me as well. I was actually wondering about why only the "1" had gotten multiplied by two and not the "-4". Anyways thanks guys for helping me!

But again, the last two I don't really know how even start...if you guys could give me any tips?

Jesus this is a great forum, you guys really help each other out. I thank you guys for helping me as well. I was actually wondering about why only the "1" had gotten multiplied by two and not the "-4". Anyways thanks guys for helping me!

But again, the last two I don't really know how even start...if you guys could give me any tips?

For some reason I just can't get this...could someone just tell me the answer, I hate asking but as you can see I do try to do the problems but this one I think I just need to see what to do in order to actually fully understand.

Try drawing the vector on a set of axes [remember that it goes from the origin to (-3, -15)]. You should be able to find the angle made with the axis using trigonometry.

Originally Posted by Altami

For some reason I just can't get this...could someone just tell me the answer, I hate asking but as you can see I do try to do the problems but this one I think I just need to see what to do in order to actually fully understand.

11.8 degrees can anybody verify this?

That is nearly the angle between the negative y-axis and the vector. But again: As long as you don't post your working we can't show you what you've done wrong and what you should do instead.

As ProveIt suggested draw the vector. The direction is determined by the angle between the positive x-axis and the vector, measured anti-clockwise.
The head of the vector (the point C(-3, -15)) is situated in the 3rd quadrant, thus the angle in question must be greater than 180°.